重庆大学学报2017，Vol.40Issue(12)：79-86,8.DOI:10.11835/j.issn.1000-582X.2017.12.010
过硫酸盐对有机废水CODCr测定的干扰及消除
Elimination of persulfate interference in determination of COD in organic wastewater
摘要
Abstract
As a new advanced oxidation technology,advanced oxidation process of persulfate has been widely used in wastewater treatment and chemical oxygen demand(COD)is usually taken as an important indicator to identify the characteristics of organic wastewater.When COD is determined by potassium dichromate method,the residual persulfate in organic wastewater has interference with the measurement results.Therefore, the interference mechanism is investigated and the elimination measures of the interference are proposed.The results reveal that CODCr testing values are higher than the actual values for the reducibility of residual sulfate (S2 O28-).The interference degree varies with the concentrations of S2 O28- in the wastewater.The relationship between concentration of S2 O28- and CODCr is obviously linear in both high and low CODCr concentration measuring range.For CODCr ranging from 0 to 150 mg/L and CODCr ranging from 0 to 1 500 mg/L,the linear relationship and the contributions of CODCr concentration variation by 1g S2 O28- are y =36.120 2x +0.571 1(R 2= 0.997 9),36.120 2 mg and y =45.171 6x +38.031 6 (R 2 =0.998 4),45.171 6 mg respectively.In CODCr standard solution system and the actual wastewater system,the percentage of DCODCr 1 (contribution value of CODCr by S2 O28-)and DCODCr 2 (the difference between CODCr measured value and raw wastewater actual value)is less than 10% of the actual CODCr in raw wastewater.The actual CODCr value of water sample could be accurately calculated by deducting DCODCr 1 based on the linear equation which could effectively eliminate the interference caused by residual S2 O28- in CODCr determination.关键词
重铬酸钾法/有机废水/过硫酸盐/干扰/消除Key words
potassium dichromate method/organic wastewater/persulfate/interference/elimination分类
资源环境引用本文复制引用
曾晓岚,黄永周,张玉,罗万申,李仲,丁文川..过硫酸盐对有机废水CODCr测定的干扰及消除[J].重庆大学学报,2017,40(12):79-86,8.基金项目
重庆市自然科学基金项目资助(CSTC,2011BB7099) （CSTC,2011BB7099）
高等学校学科创新引智计划资助(B13041).Supported by Natural Science Foundation of Chongqing(CSTC,2011BB7099)and the 111 Project(B13041). （B13041）
